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  • Title: [Role of the auditory cortex in animal recognition of synthesized vowels].
    Author: Baru AV, Shmigidina GN.
    Journal: Zh Vyssh Nerv Deiat Im I P Pavlova; 1976; 26(6):1165-73. PubMed ID: 1014888.
    Abstract:
    Discrimination of synthesized vowels [a] and [i] was studied in intact dogs and animals with an ablated auditory cortex. Electro-defensive and conditioned reflex methods were used. It has been found that as a result of learning an auditory image of a stationary vowel can be formed in intact dogs, which is invariant relatively to any change in the basic frequency of the voice, the intensity and duration of presentation (300 to 75 msec), and that two formants are sufficent for discrimination. The auditory image of the vowel is preserved after a bilateral ablation of the auditory cortical projection zone. Discrimination of vowels is disturbed in animals with a removed auditory cortex when information redundancy is reduced (diminished number of formants and reduced signal duration).
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